[Coupling Effect of Digitization and Greening and Its Impact Mechanism on New Quality Productivity]

Digitization and greening are the preferred paths for the current development of new quality productivity. Accordingly, by constructing indicators of digitization, greening, and new quality productivity, we analyze the coordination degree of digitization and greening coupling and its promotion mechanism for the improvement of new productivity in 30 provinces in China from 2012-2022 by using the modified coupling, benchmark regression, mediating effect, moderating effect, and threshold effect models. The results showed that: First, the overall coupling coordination of digitization and greening was not high, but it was gradually increasing, and there was an obvious clustering effect, with "Beijing-Shanghai-Guangdong" dominating in the east, "Hubei" dominating in the center, and "Sichuan-Chongqing" dominating in the west, manifesting itself in the form of an "eastern leading, central lagging, rise of the west" pattern. Second, in promoting the development of new quality productivity, the coupling effect of digitization and greening showed a significant positive contribution in different regions, with the most significant contribution in the eastern region, followed by that in the central region, and relatively weaker in the western region. Further mechanism analysis revealed that science and technology innovation played an important intermediary role in promoting the development of new productivity through the coupling effect of digitization and greening, which was further enhanced by the increase in the level of industrial agglomeration. In addition, the impact of environmental regulation on the coupling effect of digitization and greening showed an inverted "U" shape, and excessive environmental regulation may weaken its effect on the promotion of new productivity.